Transmission mechanism.



G. H. BUGENHAGEN.

TRANSMISSION MECHANISM. APPLICATION FILED AUG-22, I917.

I MTI M MMMW Patented July 23, I918.

3 SHEETS-SHEET I.

%m f% Fig. 11

G. H. BUGENHAGEN.

TRANSMISSION MECHANISM.

APPLICATION FILED Aus.22, I917.

LMMS MMMW Patented July 23, 11918.

3 SHEETS-SHEET 2.

G. H. BUGENHAGEN TRANSMISSION MECHANISM.

APPLICATION FILED AuG.22. 1917.

Patented July 28, 1918.

3 SHEETS-SHEET 3.

I being variable Y arranged coaxially with respect to the shaft EUGIE H.IBUGENHAGFN, 0F MTNUT, NORTH uaoru.

TRANSMISSION MECHANISM.

Specification of Letters Patent.

Fatented duly flu.

'-fl.pplieation filed August 22, 1917. Serial No. rat/nee.

To all whom it may concern:

Be it known that l[, Guoncn H. Boomi- HAGEN, a citizen of the UnitedStates, residing at Minot, in thecounty of Ward and State of NorthDakota, have invented certain new and useful Improvements in Transmission Mechanism, of which the following is a specification.

This invention relates to transmission gearing of the planetary type inwhich different speeds are obtained by causing certain parts of themechanism to operate against a fluid resistance or check, the latter sothat any speed, from neutral up to the full. speed of the drivingelement, may be obtained; a

The invention has for its ob ect to provide a novel and improvedmechanism of the kind stated, and one which is simple in constructionand highly eflicient in operation.

Other objects and advantages of the invention will be pointed out in thedetailed description appearing hereinafter.

In order that the invention may be better understood, reference is hadto the accompanying drawings forming a part of this specification, andin said drawings Figure 1 is the longitudinal section of the mechanismtaken on the line A-A of Fig. l; Fig. 2 is a cross section on the lineB-B of Fig. 1; Fig. 3 is a detailview showing the means for operating athrottle valve, and Fig. 4 is a cross section on the line 0-0 of Fig. l.

Referring specifically to the drawings, 01 denotes a driving shaft and za driven shaft. These two shafts are in axial alinement, and

extend into a casing cm which incloses the gear mechanism associatedwith said shafts. One end of this casing has a bearing y 1n which theshaft 2 turns, and in the hub b of an internal gear 6 fast on said shaftis a bearing 0 in which the shaft (1 turns. On that end of the shaft (2which is supported in thebearing c is fastened a drive pinion m. On theother end of the shaft d is a flange a for connection of said shaft tothe power source. At diametrically opposite points, the pinion 'm is inmesh with plan etary pinions Z, each of the latter being carried by andfast on a shaft h. In the casing am is located a fluid containerorhousing 6 in the form of a drum rotatably mounted in bearings f and g,respectively. This drum is d, and the latter extends thereinto. At thecenter of the drum is a hub e through which the shaft d passes, and atone end of the drum the hub is continued into a hollow through amechanism to be presently described, it may be caused to rotate withsaid shaft, and also to be held stationary with respect thereto.

In the drum e are located two diametrically opposite rotary pumps, eachof which.

has two rotors is in the form of intermeshin toothed wheels, the teethor blades of whic latter form radial suction and forcing pistons. Une ofthe rotors is fast on a shaft 71', and the other rotor is fast on theshaft h. The other shaft h is connected to one of the rotors of theother pump. Thus it will be seen that the rotors obtain motion from theshaft d through the pinions m and l.

The. drum 0 has a pressure chamber 0 and a fluid reservoir chamber a. Tna communicating channel between these two chambers is a throttle" valveof, and connection between the chambers is also had through a reliefvalve aq. The pressure chamber is formed'with two pockets 0 in which thepump rotors 7c worlr, said pockets having inlets 'n/ from the chamber a,and outlets 0 into the chamber 0. Thus, there is no communicationbetween the chambers o and n except through the pump rotors It, and thevalves of and 01g.

The reservoir chamber a will be provided with a filling aperture n inone of its end walls, said aperture being located a sufficient distancefrom the rim of the drum e so that in filling the chamber there willalways remain a portion unfilled to form an air cushion for reverseshocks.

The shafts .h are supported in bearings i and y carried by the end wallsof the drum 6. The bearings j are closed by caps u. Bearings similar tothe bearings y are provided for both ends of the shafts h. The ends ofthe shafts k which carry the p-iriions Z are provided with stuflingboxes ing'screw plugs g for compressin ing around the shafts, these inbeing on the end wall of the d.

boxes that might tend to escape through the I ing studs at inside of afis closed entirely,

packing.

One end of the drum 6 has removable walls ac in order that access to theinterior of the drum may be had for the ready assembly of the pumprotors k.

The throttle valve af is a rotatable plug having two passagewaysproviding communication between the chambers 0 and n. The valve plug hasa radial lever arm 0:9 connected by a ball-and-socket joint ale to a'connecting rod any, which latter is connected to a sliding collar '0 bya pin ah, said collar having a peripheral groove, and being slidablymounted on a shaft extension 6 In the groove of the collar seat the lugsw of a shifter yoke w made fast on a rock shaft 00 supported in bearingsm on the casing am. A suitable lever arm ar is fastened on the shaft wfor actuating the sameu- When the shaft 00 is rocked, the collar 11 isslid on the part 6 and through the connections ah, aj, ale and agbetween said collar and the valve af, the latter is operated to open orclose entirely or partly.

The relief valve a9 is designed to open to a certain predeterminedpressure in the chamber 0, to permit escape of the fluid therefrom intothe chamber n, and thus prevent overstrains. '-The valve will be madeadjustable to respond to any desired excess pressure. 40

For obtaining a reverse motion a'brake band ab is associated with thedrum 6, said band encircling the rim of the drumextere nally, and beingengageable therewith! The ends of the brake band havesuitableconnections with a rocker arm aZ on a shaft am provided with a suitableactuating lever an. The casing aa is provided with a removable cover a0so that access to the brake band ab, for assembly readily had. On theinterior. surface of the casing aa are inwardly and radiallyprojectwhich the brake band ab is located. These studs are for thepurpose of obtaining a uniform clearance of the brake band throughoutthe perimeter of the drum 6.

'The operation of the mechanism may be summarized as follows:

en power is applied to the shaft (Z to turn the same, the pinion m,being fast on sald shaft, turns the pinions Z, and the latter operatethe pump rotors k. If now the valve the rotors are locked by theresistance of the fluid confined in the chamber 0, and hence the drum (2starts to and removal thereof, may be turn with the shaft 0?. Thepinions Z now having no independent rotation, clutch the gear 6, and thelatter therefore turns with the shaft, and as it is fast on the shaft a,said shaft is driven at the same rate of speed as the drive shaft (Z. Toreduce the rate of speed at which the shaft 2 is driven, it is necessaryonly to open the valve af more or less according to the degree of speedreduction desired. When the valve is wide open, the fluid can freelycirculate between the chambers o and n, and hence no motion istransmitted to the shaft 2, the pinions Z now merely rolling idly aroundthe gear 6. The rate of speed imparted to the shaft 2 is inverselyproportionate to the ability of the fluid to circulate between thechambers 0 and n, and by operating the valve of any speed from that ofthe speed of the shaft (Z to neutral, may be obtained.

To obtain a reverse motion of the shaft 2, the brake band ab is operatedto hold the drum 6 stationary. The shafts it are now held in anunchangeable position relative to the shaft d, 2'. e.they do not revolvearound said shaft, but they are free to rotate when the valve of isopened, and hence through the pinions Z and the gear Z) the motion ofthe shaft d is transmitted in a reverse direction to the shaft 2. i

It will be noted that the pumps are located on diametrically oppositesides of the shaft 0?, in view of which the mechanism is perfectlybalanced, and no counterweights are required. The pinions Z which drivethe pumpsreact on the gear I; the exact amount of pressure that istransmitted by the shaft (Z, and with the larger diameter of the gear 6,it will be seen that the power is increased in proportion to therelative size of the said gear and pinions, and hence a reduction ofspeed is not accompanied by a drop of power, but by an increase ofpower, the power being multiplied by the gear and pinions in, the samemanner as any ordinary gearing process. The speed ratio can be readilyvaried by simply changing the size "of the pinions Z and m.

The fluid employed may be water, oil, or any other free flowing liquidwhich will afford a minimum resistance when the gearing 'is in neutral.Referring to Fig. 2 it will be seen that the cylindrical wall of thedrum 0 forms the outer wall of the chamber a, and that the chamber 0 isinside this chamber nearest to the center of the drum. As the fluid,when the drum is in motion, has a tendency to flow outward toward theperiphery of the drum, this being due to the centrifugal force, and theinlets a are adj acent to and opposite to the drum periphery, it will beseen that a suflicient fluid supply to the pump is assured'so long asthe chambers n and 0 contain a sufficient volume of liquid.

iavaaaa in the drum located on diametrically opposite sides of its axis,the drum containing fluid reservoir and pressure chambers for the pumps,a valve-controlled connection be-.

tween said chambers, adrive pinion on the drivin member, and pumpdrlving pinions carrie by the drum and meshing with said pinion and alsoin mesh with'the aforesaidgear. I

2. A transmission mechanism comprising a driving member, a drivenmember, a hollow drum mounted coaxially with respect to the drivingmember, rotary pumps in the drum located on diametrically opposite sidesof its axis, the drum containing iluid reservoir and pressure chambers,the pressure chamber being located in the center of the drum and havingdiametrically opposite pockets in which the pumps work, and the,

reservoir chamber surrounding the pressure chamber and having inletsinto the pockets, the pockets having outlets into the pressure chamber,a valve-controlled connection between the reservoir and the pressurechambers, and means for transmittin motion from the drum to the drivenmem er.

3. A transmission mechanism comprising a driving member, a drivenmember, a planetary gearing between said members, a drum carrying theplanetary pinions or said gearing, a pump in, the drum driven by saidpinions, said drum containing fluid reservoir'and pressure chambers forthe pump, a valve controlled connection between the chambers, and arelief valve between the pressure chamber and the reservoir chamheropening to excess pressure in'the firstmentioned chamber.

4. A transmission mechanism comprisin a driving member, a driven member,a hollow drum carried by the'driving member,

a rotary pump in the drum, said drum con- I taining .filuidreservoir andpressure cham-.

bers for the pump, a-valve-controlled eonnection between said chambers,a relief valve I pinions, said spect to the driving member, rotary pumpsbetween the pressure chamber and the reser voir chamber, and means fortransmitting motion or the drum to the driven member.

5. A transmission mechanism comprising a driving member, a drivenmember, a planetary gearing between the said members, a drum carryingthe planetary pinions of said gearing, a pum in the drum driven by saidrum containing fluid reservoir and pressure chambers for the pump, avalve-controlled connection between the chambers, a brake bandassociated with the drum for holding the same stationary relative to thedriving member, and a casing 1nclosing the drum and the brake band, saidcasing having inturned projections on its interior between the outerends of which and the periphery of the drum the brake band is located.

6. A transmission mechanism comprising a drlvlng member, a drivenmember, a hollow drum mounted coanially with respect I to the drivingmember, rotary pumps in the drum located on diametrically opposite sidesa of its axis, the drum containing fluid reservoir and pressure chambersfor the pump, a valve-controlled connection between said chambers, andmeans for transmitting the motion of the drum to the driven member.

7. A transmission mechanism comprising a driving member, a drivenmember, a gear for imparting motion to the driven member,

a hollow drum mounted coaxially with respect to the driving member,rotary pumps in the drum located on diametrically opposite sides oit itsaxis, the drum containing lluid reservoir and pressure chambers, thepressure chamber being located in the center of the drum and havingdiametrically opposite pockets in which the pumps work, and thereservoir chamber surrounding the pressure chamber. and having inletsinto the pockets, the pockets having outlets into the pressure chamber,a valve-controlled connection between the reservoir and the pressurechambers, a drive inion on the driving member, and pump riving pinionscarried by the drum and meshing with said pinion and also in mesh withthe aforesaid ear.

g lln testimony whereof ll aifix my signature.

/ GEORGE ll. BUGENHAGEN.

Witness:

an flnarrmnn.

lllld lid

